Chi-Square Problems

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An investigator observes
that when pure-breeding long-wing Drosophila are mated with pure-breeding
short-wing flies, the F1 offspring have an intermediate wing length.

When several
intermediate-wing length flies are allowed to interbreed the following results
are obtained:

Observed

230 long wings

510 intermediate length wings

260 short wings

- What
is the genotype of the F1 intermediate-wing length flies?
- Write
a null hypothesis describing the mode of inheritance of wing length in
Drosophila.
- Calculate
the Chi-Square.
- What
degree of freedom do you use?
- What
is the probability value for these data?
- According
to the probability value, can you accept or reject the null hypothesis and
explain why.